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So for those of you who have watched this movie adaptation of the manga, can you please explain what actually happened at the end? It was a bit unclear and yeah i was kinda confused...

please tell me what the scenes near the end meant (in spoilers so that th e ppl who havent watched it don't find out).
Thanks =p

I still have some missing points about it.
For example, the kid, what was him?was him ill?It doesn't seem, but then..?!
And the castle, was it a flying dragon to spread those spines and build a 'perfect' world for the 'summoned sister' by the summoner one, as far as i understood, and that's fine, but then, the kid was a kind of guide to protect the summoned, and again fine, but still don't see what he is, and...Alice?the pc?What was it, and why did she/it tried to kill Marco?Quite a messy ending, i needed more details to get a full view of the story.